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ASoC: davinci-mcasp: add support for suspend and resume

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When the system returns from suspend, it looses its configuration. Most
of it is restored by running a normal audio stream startup, but the DAI
format is left unset as that's configured on the audio device creation.

Hence, it suffices here to care for the registers which are touched by
davinci_mcasp_set_dai_fmt() and restore them when the system is resumed.

Signed-off-by: Daniel Mack <zonque@gmail.com>
Signed-off-by: Mark Brown <broonie@linaro.org>
This commit is contained in:
Daniel Mack 2013-10-01 14:50:02 +02:00 committed by Mark Brown
parent bcf25567ec
commit a85e419ede
2 changed files with 51 additions and 0 deletions
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39
sound/soc/davinci/davinci-mcasp.c
View File

@ -1251,12 +1251,51 @@ static int davinci_mcasp_remove(struct platform_device *pdev)
return 0;
}
#ifdef CONFIG_PM_SLEEP
static int davinci_mcasp_suspend(struct device *dev)
{
struct davinci_audio_dev *a = dev_get_drvdata(dev);
void __iomem *base = a->base;
a->context.txfmtctl = mcasp_get_reg(base + DAVINCI_MCASP_TXFMCTL_REG);
a->context.rxfmtctl = mcasp_get_reg(base + DAVINCI_MCASP_RXFMCTL_REG);
a->context.txfmt = mcasp_get_reg(base + DAVINCI_MCASP_TXFMT_REG);
a->context.rxfmt = mcasp_get_reg(base + DAVINCI_MCASP_RXFMT_REG);
a->context.aclkxctl = mcasp_get_reg(base + DAVINCI_MCASP_ACLKXCTL_REG);
a->context.aclkrctl = mcasp_get_reg(base + DAVINCI_MCASP_ACLKRCTL_REG);
a->context.pdir = mcasp_get_reg(base + DAVINCI_MCASP_PDIR_REG);
return 0;
}
static int davinci_mcasp_resume(struct device *dev)
{
struct davinci_audio_dev *a = dev_get_drvdata(dev);
void __iomem *base = a->base;
mcasp_set_reg(base + DAVINCI_MCASP_TXFMCTL_REG, a->context.txfmtctl);
mcasp_set_reg(base + DAVINCI_MCASP_RXFMCTL_REG, a->context.rxfmtctl);
mcasp_set_reg(base + DAVINCI_MCASP_TXFMT_REG, a->context.txfmt);
mcasp_set_reg(base + DAVINCI_MCASP_RXFMT_REG, a->context.rxfmt);
mcasp_set_reg(base + DAVINCI_MCASP_ACLKXCTL_REG, a->context.aclkxctl);
mcasp_set_reg(base + DAVINCI_MCASP_ACLKRCTL_REG, a->context.aclkrctl);
mcasp_set_reg(base + DAVINCI_MCASP_PDIR_REG, a->context.pdir);
return 0;
}
#endif
SIMPLE_DEV_PM_OPS(davinci_mcasp_pm_ops,
davinci_mcasp_suspend,
davinci_mcasp_resume);
static struct platform_driver davinci_mcasp_driver = {
.probe = davinci_mcasp_probe,
.remove = davinci_mcasp_remove,
.driver = {
.name = "davinci-mcasp",
.owner = THIS_MODULE,
.pm = &davinci_mcasp_pm_ops,
.of_match_table = mcasp_dt_ids,
},
};

12
sound/soc/davinci/davinci-mcasp.h
View File

@ -43,6 +43,18 @@ struct davinci_audio_dev {
/* McASP FIFO related */
u8 txnumevt;
u8 rxnumevt;
#ifdef CONFIG_PM_SLEEP
struct {
u32 txfmtctl;
u32 rxfmtctl;
u32 txfmt;
u32 rxfmt;
u32 aclkxctl;
u32 aclkrctl;
u32 pdir;
} context;
#endif
};
#endif /* DAVINCI_MCASP_H */